1. The ERR problem is an under-voltage problem, which is usually caused by the problem of voltage detection loop resistance or wiring, rather than the actual input voltage showing undervoltage. Most of the OC problems of the A200 series are caused by the damage of the drive circuit, and its drive circuit uses a thick film circuit with a ceramic package, which brings certain difficulties to maintenance, and its thick film circuit is mainly based on a circuit planned to drive the optocoupler.
2. Aging of the drive circuit
Because the use of a long period of time will inevitably lead to the aging of the components, and then cause the drive waveform to be distorted, and the output voltage will be unstable, so the OC alarm is often displayed as soon as it is operated.
3. The damage of the IPM module will also cause OC alarm
The power module used in the Z024 series equipment not only contains over-current, under-voltage and other detection circuits, but also contains an enlarged drive circuit, so it is not necessary to detect the damage of the circuit or the damage of the drive circuit.
As well as damage to high-power transistors, OC alarms may occur.
4. Most of the reasons for the lack of display problems are caused by the damage of the thick film of the switching power supply.
5. In addition, there will be some LV problems, and the undervoltage problem is also eighty percent because of the bus detection circuit problems, Mitsubishi inverter has also planned a thick film circuit for detecting voltage and current. The damage of the switching power supply pulse transformer is also a common problem of A200 series frequency converters, because of the short circuit of the switching power supply output load, or the sudden change of bus voltage, resulting in the damage of the primary and secondary windings of the pulse transformer.
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